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Revised
14/06/2005
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Tartarini Etagas System as Installed in My Galaxy |
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ETAGAS
injection system for LPG: engine kit |
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 The Etagas system is an
electronically controlled gas fuelling system that can be installed on
all injection vehicles equipped with closed-loop type control system.
Compared to the “conventional” LPG systems, the gas is injected very
near the in-take valves and therefore there is no longer any risk of
backfiring. The gas sent from the cylinder flows through the
regulator-vaporizer and supplies the distributor that establishes its
flow rate towards the injectors fitted near the petrol
electro-injectors. The processor of the Etagas system processes the
following signals to control the fuel setting correctly: engine RPM,
Lambda probe and TPS, commanding both step motors of the distributor
which enable the system to promptly respond to the inputs for more fuel,
whereas in the deceleration phases the cut-off device triggers to reduce
the amount of fuel sent to the engine to optimise the engine braking
effect and to reduce pollutant emissions. The Lambda signal provides the
indications relative to the combustion trend. The signal of the probe is
processed by the Etagas CPU to adjust the flow of fuel to the engine.
The temperature signal of the regulator-vaporizer is exploited to
control the switching function from petrol to gas. When the programmed
temperature is reached the Etagas CPU sends the enabling signal required
to switch from petrol to gas. |
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LPG
REGULATOR-VAPORIZER G/ETAGAS
The LPG regulator-vaporizer is the
single-stage diaphragm type and is compensated by the vacuum inside the
in-take manifold. It is designed to ensure a higher output pressure than
the pressure inside the in-take ducts of the engine. The
regulator-vaporizer is complete with an internal channel where the
engine coolant flows to ensure that the LPG vaporizes completely. A
solenoid valve complete with filter has been fitted on the inlet of the
regulator. A temperature sensor and a safety valve have been fitted on
the regulator casing. |
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ELECTRONIC ETAGAS CPU
The electronic Etagas CPU is connected in
parallel to the original petrol CPU. All the signals sent: TPS, engine
RPM and Lambda probe are processed by the Etagas CPU and converted into
electrical signals to command the two step motors fitted in the
distributor, thus optimising the vehicle driving performance. The CPU is
the self-calibrating and self-adapting type. In fact, when the installer
has completed the conversion, he connects a PC and executes the initial
set-up of the basic parameters and, if the dedicated map for the
specific vehicle is not stored in the "data base", he can execute the
mapping for that vehicle simply by entering the parameters relative to
the engine specs. The CPU also performs other functions, amongst which
are the following: - Possibility to automatically switch from petrol to
gas in acceleration or deceleration - Possibility to choose the engine
rpm at which the system switches from petrol gas - Pre-arrangement for
most Italian and foreign level sensors - Pre-arrangement to read all
types of Lambda probe - Pre-arrangement to emulate the most common
Lambda probes - Pre-arrangement to accept all types of TPS signal
including vehicles controlled by “Drive by wire” system -
Pre-arrangement to automatically switch back to petrol if the system
should encounter any anomalies or if the gas should run out -
Pre-arrangement to analyse the anomalies recorded and to run the
diagnosis function of the CPU itself. |
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DISTRIBUTOR
The distributor, made of resin, has been
considerably reduced in weight and size and can be easily installed in
the engine bay. The distributor outputs an even amount of gas for each
cylinder. This function is performed by two separate and independent
step motors that receive the electric signal from the Etagas CPU to
control the flow of Gas through a calibrated seat. One step motor
controls the cut-off and shuts off the flow of Gas when the vehicle is
running on petrol or when it is parked, the other, by means of two
calibrated pins, controls the mix at minimum, low and high speed. This
element is integrated with two calibrated injectors, the size of which
varies based on the unit displacement and on the specific power of the
vehicle and are to be installed right next to the petrol
electro-injectors. |
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SWITCH UNIT
This very small electronic module is
installed inside the vehicle compartment in a handy position for the
driver. Thanks to its very small size it can be fitted in the place of
an empty switch on the dashboard or a hole can be punched for it on the
dashboard using a hot punch. The switch unit has the following
functions: - It acts as a 2-position gas/petrol selector switch and
indicates the fuel in use by means of two LED’s: A yellow one is lit
when running on gas and a red one is lit when running on petrol. - It
displays the amount of gas in the tank/cylinder by means of five LED’s:
four green ones (1/4; 1/2; 3/4 and 4/4) and a red one for reserve. - It
informs the driver on any anomalies encountered in the Etagas system by
means of the red petrol LED that starts to flash. |
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LPG BOOT KIT WITH
TOROIDAL CYLINDER
The toroidal cylinder has a capacity of up
to 72 Litres and is usually fitted in the boot instead of the spare
wheel. There are some variants to this solution, depending on where the
spare wheel is arranged and on the configuration of the vehicle board.
In this type of cylinder the choice of the multi-valve depends on the
height of the cylinder and on the position of the flange in relation to
the horizontal surface. If a cylinder is fitted instead of the spare
wheel inside the boot and with multi-valve also inside, a hermetic
container must be installed (or airtight chamber) that conveys any leaks
of gas outside the vehicle by means of aeration tubes or ducts.
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LPG MULTI-VALVE
This is without doubt one of the most
complex parts of the LPG system and is fitted on the cylinder. The
multi-valve consists of a mechanical unit that enables the following: -
It is used for re-fuelling - It blocks the refuelling phase at 80% of
the total volume of the cylinder -It in-takes the LPG when the vehicle
is running on gas by means of the primer tube - It indicates the amount
of LPG in the cylinder which, if appropriately connected to an electric
sensor, can send the signal of the fuel level inside the cylinder to the
driver. - It intercepts the LPG by means of a solenoid valve when the
vehicle is parked or when it is running on petrol. The multi-valve is
also equipped with safety devices that trip if the pressure inside the
cylinder should rise due to external factors (safety valve and
heat-melting pad) and with safety devices that trip if the tubes should
accidental burst (overflow valves). |
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